9514 1404 393
Answer:
C, E, F
Explanation:
The equation f(x) = log₉(x) can be rewritten as ...
x = 9^y
This form makes it relatively easy to check the given points.
A. 9^2 = 81 ≠ -1/81
B. 9^1 = 9 ≠ 0
C. 9^-1 = 1/9 . . . . one of the points of interest (1/9, -1)
D. 9^243 = <very big number> ≠ 3
E. 9^1 = 9 . . . . one of the points of interest (9, 1)
F. 9^2 = 81 . . . . one of the points of interest (81, 2)